forked from CGM_Public/pretix_original
106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
import re
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from django.conf import settings
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def set_cookie_without_samesite(request, response, key, *args, **kwargs):
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assert 'samesite' not in kwargs
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response.set_cookie(key, *args, **kwargs)
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if should_send_same_site_none(request.headers.get('User-Agent', '')):
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# Chromium is rolling out SameSite=Lax as a default
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# https://www.chromestatus.com/feature/5088147346030592
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# This however breaks all pretix-in-an-iframe things, such as the pretix Widget.
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# Sadly, this means we need to forcefully set SameSite=None and rely on our other
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# CSRF protections to be working.
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response.cookies[key]['samesite'] = 'None'
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# This will only work on secure cookies as well
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# https://www.chromestatus.com/feature/5633521622188032
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response.cookies[key]['secure'] = (
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kwargs.get('secure', False) or request.scheme == 'https' or
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settings.SITE_URL.startswith('https://')
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)
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# Based on https://www.chromium.org/updates/same-site/incompatible-clients
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# Copyright 2019 Google LLC.
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# SPDX-License-Identifier: Apache-2.0
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def should_send_same_site_none(useragent):
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# Don’t send `SameSite=None` to known incompatible clients.
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return not has_web_kit_same_site_bug(useragent) and not drops_unrecognized_same_site_cookies(useragent)
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def has_web_kit_same_site_bug(useragent):
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return is_ios_version(12, useragent) or (
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is_macosx_version(10, 14, useragent) and (is_safari(useragent) or is_mac_embedded_browser(useragent))
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)
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def drops_unrecognized_same_site_cookies(useragent):
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if is_uc_browser(useragent):
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return not is_uc_browser_version_at_least(12, 13, 2, useragent)
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return (
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is_chromium_based(useragent) and is_chromium_version_at_least(51, useragent) and
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not is_chromium_version_at_least(67, useragent)
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)
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# Regex parsing of User-Agent string. (See note above!)
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RE_CHROMIUM = re.compile(r"Chrom(e|ium)")
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RE_CHROMIUM_VERSION = re.compile(r"Chrom[^ /]+/([0-9]+)[.0-9]*")
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RE_UC_VERSION = re.compile(r"UCBrowser/([0-9]+)\.([0-9]+)\.([0-9]+)[.0-9]* ")
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RE_IOS_VERSION = re.compile(r"\(iP.+; CPU .*OS ([0-9]+)[_0-9]*.*\) AppleWebKit/")
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RE_MAC_VERSION = re.compile(r"\(Macintosh;.*Mac OS X ([0-9]+)_([0-9]+)[_0-9]*.*\) AppleWebKit/")
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RE_SAFARI = re.compile(r"Version/.* Safari/")
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RE_MAC_EMBEDDED = re.compile(r"^Mozilla/[.0-9]+ \(Macintosh;.*Mac OS X [_0-9]+\) AppleWebKit/[.0-9]+ \(KHTML, "
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r"like Gecko\)$")
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def is_ios_version(major, useragent):
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m = RE_IOS_VERSION.search(useragent)
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if not m:
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return False
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return m.group(1) == str(major)
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def is_macosx_version(major, minor, useragent):
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m = RE_MAC_VERSION.search(useragent)
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if not m:
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return False
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return m.group(1) == str(major) and m.group(2) == str(minor)
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def is_safari(useragent):
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return RE_SAFARI.search(useragent) and not is_chromium_based(useragent)
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def is_mac_embedded_browser(useragent):
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return RE_MAC_EMBEDDED.search(useragent)
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def is_chromium_based(useragent):
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return RE_CHROMIUM.search(useragent)
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def is_chromium_version_at_least(major, useragent):
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# Extract digits from first capturing group.
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version = int(RE_CHROMIUM_VERSION.search(useragent).group(1))
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return version >= major
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def is_uc_browser(useragent):
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return 'UCBrowser/' in useragent
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def is_uc_browser_version_at_least(major, minor, build, useragent):
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major_version = int(RE_UC_VERSION.search(useragent).group(1))
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minor_version = int(RE_UC_VERSION.search(useragent).group(2))
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build_version = int(RE_UC_VERSION.search(useragent).group(3))
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if major_version != major:
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return major_version > major
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if minor_version != minor:
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return minor_version > minor
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return build_version >= build
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